Ike Phases - ZyXEL Communications ZyWall 10 User Manual

LABEL
Authentication
Algorithm
AH
Authentication
Algorithm
Pre-shared Key
Advanced
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15.11 IKE Phases

There are two phases to every IKE (Internet Key Exchange) negotiation – phase 1 (Authentication) and phase
2 (Key Exchange). A phase 1 exchange establishes an IKE SA and the second one uses that SA to negotiate
SAs for IPSec.
VPN Screens
Table 15-7 VPN IKE
Select SHA1 or MD5 from the drop-down list box. MD5 (Message Digest 5) and
SHA1 (Secure Hash Algorithm) are hash algorithms used to authenticate packet
data. The SHA1 algorithm is generally considered stronger than MD5, but is slower.
Select MD5 for minimal security and SHA-1 for maximum security.
Select AH if you want to use AH (Authentication Header Protocol). The AH protocol
(RFC 2402) was designed for integrity, authentication, sequence integrity (replay
resistance), and non-repudiation but not for confidentiality, for which the ESP was
designed. If you select AH here, you must select options from the Authentication
Algorithm field (described below).
Select SHA1 or MD5 from the drop-down list box. MD5 (Message Digest 5) and
SHA1 (Secure Hash Algorithm) are hash algorithms used to authenticate packet
data. The SHA1 algorithm is generally considered stronger than MD5, but is slower.
Select MD5 for minimal security and SHA-1 for maximum security.
Type your pre-shared key in this field. A pre-shared key identifies a communicating
party during a phase 1 IKE negotiation. It is called "pre-shared" because you have to
share it with another party before you can communicate with them over a secure
connection.
Type from 8 to 31 case-sensitive ASCII characters or from 16 to 62 hexadecimal ("0-
9", "A-F") characters. You must precede a hexadecimal key with a "0x" (zero x),
which is not counted as part of the 16 to 62 character range for the key. For example,
in "0x0123456789ABCDEF", "0x" denotes that the key is hexadecimal and
"0123456789ABCDEF" is the key itself.
Both ends of the VPN tunnel must use the same pre-shared key. You will receive a
"PYLD_MALFORMED" (payload malformed) packet if the same pre-shared key is not
used on both ends.
Click Advanced to configure more detailed settings of your IKE key management.
Click Apply to save your changes back to the ZyWALL.
Click Reset to begin configuring this screen afresh.
ZyWALL 10~100 Series Internet Security Gateway
DESCRIPTION
15-15